package com.itheima.security;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.service.UserService;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @author ：wanghao
 * @date ：Created in 2020/12/4
 * @description ：用户的认证和授权
 * @version: 1.0
 */
@Component
public class SpringSecurityUserService implements UserDetailsService {

    // 注意：此处要通过dubbo远程调用用户服务
    @Reference
    private UserService userService;

    // 根据用户名查询用户信息
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        com.itheima.pojo.User user = userService.findByUsername(username);
        if (user == null){
            // 用户不存在
            return null;
        }
        List<GrantedAuthority> list = new ArrayList<>();
        Set<Role> roles = user.getRoles();
        if (roles==null || roles.size() ==0){
            return null;
        }
        for (Role role : roles) {
            // 授予角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();
            if (permissions !=null && permissions.size()>0){
                // 授予权限
                for (Permission permission : permissions) {
                    list.add(new SimpleGrantedAuthority(permission.getKeyword()));
                }
            }
        }

        UserDetails userDetails = new User(username,user.getPassword(),list);
        return userDetails;
    }
}
